Volkswagen Passat B8 Water Coolant Hose Tube Line Pipe 2.0 TDI 5Q0122073AL

Volkswagen Passat B8 Water Coolant Hose Tube Line Pipe 2.0 TDI is a component from the Cooling system hoses and pipes group, designed for diesel engines. It ensures efficient coolant flow between the radiator and the engine unit, which stabilizes operating temperature and supports safe system operation.

Specifications and technical data

• SKU: 5Q0122073AL
• Mark: Audi
• Condition: Used
• OEM Part Number: 5Q0122073AL
• Substitutable numbers: 5Q0122073AL, 5Q0 122 073 AL
• Fuel type: Diesel
• Part type: Hose
• Category: Coolant Hoses

Function of the coolant hose in a diesel cooling system

In diesel-powered engines, the cooling system operates under increased thermal load. The water coolant hose is responsible for the directional transport of coolant, maintaining proper circulation between the engine block and the radiator. A correctly selected hose minimizes the risk of localized overheating, leaks, and pressure drops in the circuit.

For 2.0 TDI units, a stable operating temperature has a direct impact on the durability of the cylinder head, seals, and accessories. Therefore, using a hose with the appropriate shape, diameter, and flexibility is crucial for maintaining correct flow characteristics and the reliability of the entire cooling system.

Why it is worth using a dedicated coolant hose

Selecting a water coolant hose dedicated to a specific engine and body configuration reduces the risk of installation stress, rubbing against other components, and incorrect positioning in the engine bay. In practice, this translates into:

• stable coolant flow across the full load range,
• reduced risk of leaks during temperature and pressure changes,
• better compatibility with radiator, thermostat, and engine housing connectors,
• easier, predictable installation without the need for modifications.

The component from this group is designed for resistance to temperature, coolant exposure, and vibrations generated by the power unit, which promotes longer and more predictable service life.

Product characteristics and application

The presented water coolant hose is designed for use with a diesel engine, meaning it is adapted to the specific operating conditions of diesel units – higher thermal loads and longer duty cycles. The hose construction allows for proper routing of the fluid within the engine bay, maintaining appropriate bending radii and support zones.

The product comes from the Audi brand offer, which in practice means maintaining factory geometry, compatibility with mounts, and compliance with the design assumptions of the cooling system. Thanks to this, the hose can be used both for standard maintenance replacements and for repairs following overheating failures.

Component condition and installation aspects

The offered water coolant hose is a used part, which allows for economical repair while maintaining original geometry and fitment. Before installation, a standard cooling system check is recommended – verifying the condition of clamps, connectors, the radiator, and the level and quality of the coolant.

During installation, it is worth paying attention to:

• correct positioning of the hose relative to the fan, belts, and covers,
• selection of appropriate hose clamps with the correct operating range,
• bleeding the system after refilling with fresh coolant,
• checking for leaks after the engine has warmed up to operating temperature for the first time.

Technical support and additional information

To better understand the impact of cooling hoses on engine durability and the symptoms of overheating, it is worth reading the guide on our blog: Engine cooling system – overheating, repair, and used radiators. The article discusses practical aspects of diagnostics and operation of cooling systems in modern cars.

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other components from the same group, such as additional lines, return hoses, or sections connecting the radiator to the engine, check the available parts in the Audi cooling system hoses and pipes category.